Here are some common causes and solutions for users facing an 'Unknown Device' problem. This post is a follow-up to. 1) The USB device is 'hung'. The USB device may have encountered an internal error and simply stopped functioning. The device will have a code 43 in Device Manager.

Removing all power from the device (e.g. Unplugging and re-plugging the USB cable and also the power cable if it has one) will reset the device and allow it to enumerate successfully. 2) Worn or faulty USB connectors and cables. Over time USB cables and connectors can fail. Try plugging it into a different USB port, and also using a different USB cable if it is removable. The device will have a code 43 error in Device Manager. 3) No driver is installed, and the USB device does not report a device description string.

In this case Windows was unable to find a driver for the device, and the device did not report a device description string. The device will have a code 28 in Device Manager. To resolve this problem you will need to find a compatible driver for the device, typically by contacting the device’s manufacturer. 4) There is insufficient power to start the device. If the device is downstream of a bus-powered hub, the device can enumerate successfully but may not be able to start due to insufficient power. This a bus-powered hub cannot supply more than 100mA to a port, whereas a self-powered hub can supply 500mA. The device will have a code 28 in Device Manager.

To resolve this problem, plug-in the hub’s power supply (if it has one), move the device to a root hub port, or move the device to another hub that is self-powered. 5) The upstream hub has failed or is 'hung'. If the device is connected to an external hub, try moving the device to a different hub or a root port.

If the device enumerate successfully, try power-cycling the hub or removing/replacing it. Device will have a code 28 in Device Manager. 6) The USB device has failed.

It is possible that the USB device itself has suffered a hardware failure and is no longer functional. You will need to replace the device. Device will have a code 43 in Device Manager. -Martin Borve. What if a USB port suddenly starts working intermittently at best and no error code is visible in Device Manager (Vista 32bit)? This started about two months ago, and it's driving me nuts. More specifically: one of my Acer laptop's USB ports suddenly stopped working.

The optical mouse doesn't function at all on that port (no 'unknown device', no error message, no error code), while both the portable hard drive and a couple of USB flash drives (all of which work fine on other USB ports) trigger the 'unknown device' message in Device Manager. To identify the malfunctioning port, I plugged in a flash drive and got several screenshots of the details. The 'problem code', however, appears as '00000000'. I checked the power options, I've used the 'scan for hardware changes' (no error), 'disable'/'enable', and 'uninstall' options, rebooting the system in the latter case to re-install the device, I've rolled back the driver, I've tried starting in safe mode – all to no avail. Acer support's only advice was to re-install Windows from scratch. A lame solution, but I tried it anyway: for about 2 days, the port worked properly – after that, it went dead again.

Download the latest drivers for your Generic USB Hub to keep your Computer up-to-date. GL850G GL850 SSOP-28 USB 2.0 HUB Controller. Condition: New product. This product is no. Improve output drivers with slew-rate control for EMI reduction.

This suggests that some update might be the culprit, however, System Restore did not fix the problem and, of course, wiping out the hard drive and freezing all updates is not a solution. Any suggestions on how to identify what causes the problem and on how to fix it?

Perhaps you can suggest a hardware diagnostic tool that could give me a clue? Thanks for any advice. It appears this problem is being ignored at MS. What IS the latest for this issue (which I have since going to Windows 8.1. Using the info supplied by the MS USB CORE TEAM requires a PHD in Computer Technology. Is close to worthless for the average user.

Tekken blood vengeance full movie free download in hindi mp4. My USB device that's getting a code 43 is somehow permanently installed since I have no external devices connected. I'm using the same monitor as for the past 6 years if that's a USB device. It seems to me that somewhere along the line a device is failing. To know that the device is failing should indicate that the machine knows what device it's looking for and did not find. Why the hell can't the error message tell us 'Machine was looking for Device XXXXX and did not find it in the Device Descriptor List, which can be viewed at YYYYYYYY.'

Come on guys! The data is available somewhere, share it with us.

As I'm an old lady, I have read this info with the thought of possibly finding out what is happening with my computer. I accidentally printed out page after page of what has been going on with my LG motherboard. I have been trying to find an answer to what this PNP Device ID means. Thought it might have something to do with my 'messages on my computer telling me 'My session has ended.' And my inability to send e-mails out in response to ones coming in. TWC can't help. Sure wish I had my old AMD system back.